Everyone -- and we do mean nearly everyone -- has seemingly dropped by this time around, from besties like Selena Gomez to newcomers such as Andy Grammer. (For the record, we're only counting guests who actually performed with Swift, not just people who walked the runway.)

But even among all the special guests, there have been some seriously surprising ones, even by Swift's own be-prepared-for-anything standards.

Five of the most surprising -- but delightful -- tour guests so far are below.

1. Uzo Aduba
The Orange in the New Black fave surprised fans with a pitch-perfect throwback of Fearless standout "White Horse" in Los Angeles Aug. 22.

2. Avril Lavigne
What Bad Blood? After the Internet stirred up rumors that Lavigne wasn't the biggest fan of Swift, Swift herself put the silly rumors to bed, inviting an ecstatic Avril on stage to duet. Nothing "complicated" about that.

3. Lisa Kudrow
In hindsight, perhaps we should have seen this coming. After all, Swift self-identifies as a huge Friends fan. But it was still an unexpected treat to see Swift joined by the once and future Phoebe Buffay (Lisa Kudrow) for the classic Friends jingle "Smelly Cat."

Who is your pick for Taylor Swift's most surprising 1989 tour guest so far? Click through the gallery below to see every guest she's brought on stage.

53PHOTOS

All of Taylor Swift's guests on 1989 Tour

See Gallery

Taylor Swift's 5 most unexpected '1989 Tour' special guests

MIAMI, FL - OCTOBER 27: Taylor Swift and Ricky Martin at American Airlines Arena on October 27, 2015 in Miami, Florida. (Photo by Rodrigo Varela/LP5/Getty Images for TAS)

MIAMI, FL - OCTOBER 27: Taylor Swift and Pitbull at American Airlines Arena on October 27, 2015 in Miami, Florida. (Photo by Rodrigo Varela/LP5/Getty Images for TAS)

MIAMI, FL - OCTOBER 27: Taylow Swift and Dwyane Wade at American Airlines Arena on October 27, 2015 in Miami, Florida. (Photo by Rodrigo Varela/LP5/Getty Images for TAS)

GREENSBORO, NC - OCT 21: Taylor Swift and Miranda Lambert performs at a concert for adoring fans at the Greensboro Coliseum on October 21, 2015 in Greensboro, North Carolina. (Photo by Steve Exum/LP5 Getty Images for TAS)

ATLANTA, GA - OCTOBER 24: Recording Artist Tove Lo joins Taylor Swift on stage at The 1989 World Tour playing to a SOLD OUT Georgia Dome on October 24, 2015 in Atlanta, Georgia. (Photo by Rick Diamond/LP5/Getty Images for TAS)

ARLINGTON, TX - OCTOBER 17: Ellie Goulding and Taylor Swift perform onstage during the 1989 World Tour Live on October 17, 2015 at the AT&T Stadium in Arlington, Texas. (Photo by Cooper Neill/LP5/Getty Images for TAS)

TORONTO, ON - OCTOBER 03: Singer/Songwriters Taylor Swift and special guest Charli XCX perform onstage during The 1989 World Tour Live In Toronto - Night 2 at Rogers Center on October 3, 2015 in Toronto, Canada. (Photo by George Pimentel/LP5/Getty Images for TAS)

TORONTO, ON - OCTOBER 02: Singer/songwriters Taylor Swift and Keith Urban perform onstage during The 1989 World Tour live in Toronto at Rogers Center on October 2, 2015 in Toronto, Canada. (Photo by George Pimentel/LP5/Getty Images for TAS)

ST LOUIS, MO - SEPTEMBER 29: Taylor Swift performs with special guest Nelly onstage during the 1989 World Tour at Scottrade Center on September 29, 2015 in St Louis, Missouri. (Photo by Dilip Vishwanat/LP5/Getty Images for TAS)

NASHVILLE, TN - SEPTEMBER 26: Singer/songwriters Taylor Swift (L) and Mick Jagger perform onstage during The 1989 World Tour live in Nashville at Bridgestone Arena at Bridgestone Arena on September 26, 2015 in Nashville, Tennessee. (Photo by John Shearer/LP5/Getty Images for TAS)

NASHVILLE, TN - SEPTEMBER 26: Singer/songwriters Taylor Swift (L) and Leona Lewis perform onstage during The 1989 World Tour live in Nashville at Bridgestone Arena at Bridgestone Arena on September 26, 2015 in Nashville, Tennessee. (Photo by John Shearer/LP5/Getty Images for TAS)

NASHVILLE, TN - SEPTEMBER 25: Singer/songwriters Taylor Swift (L) and Steven Tyler perform onstage during The 1989 World Tour live in Nashville at Bridgestone Arena on September 25, 2015 in Nashville, Tennessee. (Photo by John Shearer/LP5/Getty Images for TAS)

HOUSTON, TX - SEPTEMBER 09: Taylor Swift with special guest Wiz Khalifa at The 1989 World Tour Live In Houston at Minute Maid Park on September 9, 2015 in Houston, Texas. (Photo by Bob Levey/LP5/Getty Images for TAS)

SAN DIEGO, CA - AUGUST 29: Singer-songwriters Taylor Swift (L) and Avril Lavigne performs onstage during Taylor Swift The 1989 World Tour Live In San Diego at PETCO Park on August 29, 2015 in San Diego, California. (Photo by Charley Gallay/LP5/Getty Images for TAS)

LOS ANGELES, CA - AUGUST 24: Singer-songwriters Taylor Swift (L) and Natalie Maines of the band Dixie Chicks perform onstage during Taylor Swift The 1989 World Tour Live In Los Angeles at Staples Center on August 24, 2015 in Los Angeles, California. (Photo by Christopher Polk/TAS/Getty Images for TAS)

SEATTLE, WA - AUGUST 08: Taylor Swift and Fetty Wap at CenturyLink Field on August 8, 2015 in Seattle, Washington. (Photo by Suzi Pratt/LP5/Getty Images for TAS)

SEATTLE, WA - AUGUST 08: Taylor Swift, Russell Wilson and Ciara perform at CenturyLink Field on August 8, 2015 in Seattle, Washington. (Photo by Suzi Pratt/LP5/Getty Images for TAS)

VANCOUVER, BC - AUGUST 01: Taylor Swift performs with special guests Nico and Vinz (R) during The 1989 World Tour Live at BC Place Stadium August 1, 2015 in Vancouver, British Columbia, Canada. (Photo by Jeff Vinnick/LP5/Getty Images for TAS)

CHICAGO, IL - JULY 19: Taylor Swift and Sam Hunt perform during The 1989 Tour at Soldier Field on July 19, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/LP5/Getty Images for TAS)

CHICAGO, IL - JULY 19: Taylor Swift performs with Andreja Pejic and Lily Donaldson during The 1989 Tour at Soldier Field on July 19, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/LP5/Getty Images for TAS)

CHICAGO, IL - JULY 18: Andy Grammer and Taylor Swift perform during The 1989 Tour at Soldier Field on July 18, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/LP5/Getty Images for TAS)

CHICAGO, IL - JULY 18: Taylor Swif tand Serayah McNeill perform during The 1989 Tour at Soldier Field on July 18, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/LP5/Getty Images for TAS)

WASHINGTON, DC - JULY 14: Taylor Swift and Jason Derulo perform onstage during The 1989 World Tour Live at Nationals Park on July 14, 2015 in Washington, DC. (Photo by Paul Morigi/LP5/Getty Images for TAS)

WASHINGTON, DC - JULY 13: Taylor Swift and Lorde perform onstage during The 1989 World Tour Live at Nationals Park on July 13, 2015 in Washington DC. (Photo by Kris Connor/LP5/Getty Images for TAS)

EAST RUTHERFORD, NJ - JULY 11: Nick Jonas and Taylor Swift perform onstage during The 1989 World Tour Live at MetLife Stadium on July 11, 2015 in East Rutherford, New Jersey. (Photo by Kevin Mazur/LP5/WireImage)

EAST RUTHERFORD, NJ - JULY 11: Candice Swanepoel, Lily Aldridge, Taylor Swift, Uzo Aduba, Karlie Kloss, Behati Prinsloo and Gigi Hadid onstage during The 1989 World Tour Live at MetLife Stadium on July 11, 2015 in East Rutherford, New Jersey. (Photo by Kevin Mazur/LP5/WireImage)

EAST RUTHERFORD, NJ - JULY 10: Singer/songwriter Taylor Swift (R) performs onstage with The Weeknd during The 1989 World Tour Live at MetLife Stadium on July 10, 2015 in East Rutherford, New Jersey. (Photo by Larry Busacca/LP5/Getty Images for TAS)

EAST RUTHERFORD, NJ - JULY 10: World Cup Champions U.S. Women's Soccer National Team, Heidi Klum and Taylor Swift onstage during The 1989 World Tour Live at MetLife Stadium on July 10, 2015 in East Rutherford, New Jersey. (Photo by Kevin Mazur/LP5/WireImage)

EAST RUTHERFORD, NJ - JULY 10: Singer/songwriter Taylor Swift performs onstage with Hailee Steinfeld, Gigi Hadid, Lily Aldridge and Lena Dunham during The 1989 World Tour Live at MetLife Stadium on July 10, 2015 in East Rutherford, New Jersey. (Photo by Larry Busacca/LP5/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 13: Taylor Swift performs onstage with musician Rachel Platten during The 1989 World Tour on June 13, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/LP5/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 12: Taylor Swift (R) performs onstage with Sydney Sierota of Echosmith during The 1989 World Tour on June 12, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/LP5/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 13: Taylor Swift performs onstage with actress Mariska Hargitay during The 1989 World Tour on June 13, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/LP5/Getty Images for TAS)

PITTSBURGH, PA - JUNE 06: Recording artist Taylor Swift performs with the band Little Big Town during The 1989 World Tour live at Heinz Field on June 6, 2015 in Pittsburgh, Pennsylvania. (Photo by Jason Merritt/LP5/Getty Images for TAS)

DETROIT, MI - MAY 30: Musicians Dan Reynolds of Imagine Dragons and Taylor Swift perform on stage during the 1989 World Tour Live at Ford Field on May 30, 2015 in Detroit, Michigan. (Photo by Larry Busacca/LP5/Getty Images for TAS)

DETROIT, MI - MAY 30: (L-R) Model Martha Hunt, musician Taylor Swift, and model Gigi Hadid perform on stage during the 1989 World Tour Live at Ford Field on May 30, 2015 in Detroit, Michigan. (Photo by Larry Busacca/LP5/Getty Images for TAS)